package com.yupi.yupao.job;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.yupi.yupao.model.domain.User;
import com.yupi.yupao.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * @Author eleanor
 * @Date 2024/11/9 9:08
 * @packageName:com.yupi.yupao.job
 * @ClassName:PreCacheJob
 */
@Component
@Slf4j
public class PreCacheJob {
    @Resource
    private UserService userService;

    @Resource
    private RedisTemplate<String,Object> redisTemplate;

    @Resource
    private RedissonClient redissonClient;

    //重点用户
    private List<Long> mainUserList= Arrays.asList(1l);

//    每天执行，预热推荐用户 秒-分-时-日-月-年
    @Scheduled(cron = "0 4 0 * * *")
    public void doCacheRecommendUser(){
        for(Long userId:mainUserList){
            RLock lock=redissonClient.getLock("yupao:precachejob:docache:lock");
            try {
                // 只有一个线程能获取到锁
                if (lock.tryLock(0,-1,TimeUnit.MILLISECONDS)){
                    System.out.println("getLock:"+Thread.currentThread().getId());
                    //查数据库
                    QueryWrapper<User> queryWrapper=new QueryWrapper<>();
                    Page<User> userPage=userService.page(new Page<>(1,20),queryWrapper);
                    String redisKey=String.format("yupao:user:recommend:%s",userId);
                    ValueOperations<String, Object> valueOperations = redisTemplate.opsForValue();
                    //写缓存
                    try {
                        valueOperations.set(redisKey,userPage,30000, TimeUnit.MILLISECONDS);
                    } catch (Exception e) {
                        log.error("redis set key error",e);
                    }
                }
            } catch (InterruptedException e) {
                log.error("doCacheRecommendUser error",e);
            } finally {
                // 只能释放自己的锁
                if(lock.isHeldByCurrentThread()){
                    System.out.println("unLock:"+Thread.currentThread().getId());
                    lock.unlock();
                }
            }

        }
    }
}
